Oven thermometer and ventilator.



H.. G FERBRAGHE., OVEN THERMOMETER AND VENTILATOR.

[APPLljoAToN ULEB Nov. ao, 1909.

Paeented June 20, i911.

2 SHEETB-SAEEET l.

Patented June 20, 1911.

2 SHEETS-SHEET 2.

H. o. PERBRAGHE. OVEN THERMOMETER AND VBNTILATOR.

APPLIOTION IILED NOV. 30, 1909.

75 fia 'til olztimed.

mimi-WW t3 Utili o whim@ EVEN THERMMETEH AND` VENTXLATR 'l .6 Specification of Letters iratent.

Application filed Norcmbor 3U, 1909. Soria-11 No. il.

f uoie Bonnerslierry., .in tho county ot Bonner-s iw and useful improvements in @von ifitinrmoineters and vVentilfitors. of which the llowng is a speiication.

My invention is. nn improvement in oven thermometers and ventilators, and oonsieits in Qgsrtnin novel Constr otion. and combinations of .find Stato of idillio have invented certain The @bioct o tho invention is to provid@ In dovice ott the character Specified, which tto operate at'diiierent teinpernhiros.

Referring to the drawings forming part hereof:--F1gnre l 1s a 'trontyiow ont zt portion of the oven, with tho improvement in glace. F 1g, 2 is a rear View ot Fig. ii. Fig.

is a Vfront View of tho dampor opening-S.

Figi. fr is o. seotion on the line 4.--4 of Fig.

` l. Fig. 5 is a sect-ion on the line ot the compossiterbar. Fig. 6 zt transverse section through the bar on tho lino of the movable.

.hearinglsleevo Fig. 7 is a View similar to Fig. Showing' zt modified method or' connecting the coinpoite har to the damper, sind Fig. 8 is a perspective View oit' the'har shown in Fig. 7.

lin the embodiment in the drawings, the oven casing 'l is Aprovided with damper opening consisting preferably of n plurality of sogniontnl Slots for openings Q, und n circular pluto 3 is pivotod. to the casing of the own at the centri' ot. the openings, thephito brin(r provided Y with segmental Slots or openings fl adapted to register with the slots or openings 2. when ho pinto` t is pivoted on the inside of the oven casino,

the plate is in a certain position.

tho said oven casing boing` provided with an aro-shaped Slot 5, naar thc periphory of the pinto, through which extends a pin 6 prof ,jeoting laterallyV trono 'the plate. unda.

pointer or indicator 7 is scoured to tho pin. An ard-Shaped plate 8 is secured to tho outer :tooo of 'the oven casing above the slot, and the face of the plato is provided with scale 8 with which the pointrr oopmths.

The scale is designed to indicato the teniperatnre of the oven by the oxteirt of moro parts, hereinafter dessorihrd and oit the inrrnion shown..

nient oi the pointer when acted upon by nioolmnism 'to be presently dorrihed. The plato is rotatable on the pit/ot pin S), and a wrist pin l0 is rigid with the pluto, and the opera-ting niochanisin above nnfntioned is oonnoctod with tho pin. The smid mechanism Consists oit noon'iposite composed `of Snporpoged strips il and 12 of metals Slot, on both. its inner and outer tacos, :is zity Y 15 and 16. -LL plate 1'! is secured to tho inner :face of the reinforcing plate "l5, by moans ot Screws 1S, and tho said phil@ is; provided wit i. homing sleevo i9. The composite har pasos through the sleeve i9. and cured thereto by n rivet 27 A. no@ ond bearing sleeve is slidziblo on the bnr. and the. sleove is -lnovided with a threadod stom 2l, which extends through the slot 1.4-, and is engaged outside of the oven casing' by a nut S22, whereby the bearing sioove may be clamped to the oren Woll.

The outer reinforcing; plato 1G iS movable With the stem 2l, und is provided with an indicator or pointor Q3, which cooperates with u scolo 24 on the casing. By loosening the nut 22, the Sir/vo muy bo adjusted toward and from the pivot pin of the plate, to lengthen or shorten tho oioctire length oi the composite bar.

1f desired7 the wrist pin may he replace-.d by :i pinion rigid with the pivot pin, 9, as shown in F 7, and :i rack bur 2.6 may bo scoured to the ond oi the composito bnr, the strips ll und l2 having); ouch an f mgnlnr portion il und l2 to which the rack bar is scoured, the Construction being;m otherwise the sanno.

is is known. :t bar constructed :is de srrihod Unit com ioed of u plurality of laminar Whose Cootiicients of expansion are unequal, will be flexed or bent 'when exposed to heat or cold. ln tho above construction. the our 1li-19 und (hunner are so arranged that between ertnin predetermined toznprrrti high toinperatnro, the dzimpor is Clot-sed tho composito heir being flexed toward tho lamina lOO - eeeeee having' the lowest coeiicient of expansion.' As soon as the demper is closed, the tem perature begins to rise, emi the damper again gradually opens and is held open until the high temperature falls. 'i'illien tl'ie demper is either open oi' closed, eomerlittie variation in temperature is permitted betere the damper operating meolmniem again comes into play.

The effective length of the composite be? is, as before stated, determined by the position of the movable bearing' sleeve. lt will be evident that the greater the length of the bar, the ,qi-eater will be the are oiimovemeiit of the free end thereof when affected by the unequal expansion nml contraction oit the composite bar, and the move sensitive will the bei? be to Variations in temperature. The scale is so related to the bei* that the pointer in connection with the movable bem ing sleeve will indicate thereon the tempereture at which the bei will be exeii with the bearing' sleeve at such position. The scale on the casing is so arranged that the pointez' on the damper plete will indicate the temperature by its movement.

The i pevziting mechanism is preferably covered by a cover plete 27, which is secured "to the casing of the oven by bolts Q8, and the said plate is extended, :1s et Q9, to form n bearing foi' the inner end of tbe pivot 'pin 9.' A second damper plete 3- is ai ranged on thc uterface oi the oven casing, and is pivotecl on the pivot pin 9, and the said plate is provided. with a radial lug 30, which moves between stops 3l on the oven wall to limit the movement o' the damper plete. This damper is operated manually. 'llie plate 1G guided in its movement by pins 32 extending outwardly from tbe oven casing.

Chinnl. 'In u device of the character Speeiieel, the combination with the oven having e draft opening, and n demper plete covering' the opening, of n composite bei* composed of supeiposed strips imi/ing diffei'eiut eoecients of expansion, e iixed bearing sleeve on the easing in which one emi of tile bei is secured, n connection between the ampe plate enel the other end oi the bei foi operating the plete, and means for varying the effective' length of the composite bar, saicl ineens comprising :i bearing Sleeve elicleble on the bei', e, slot in the oven casing, threaded Stem en the sleeve extentiiig through ,the slot, e mit ose tbe stem, e seele adjacent to the slot, and an iiicliezitoi: on the sleeve 'foi` cooperating with the Seele.

2. iin o device of the elieiacter speeiiieel; the Combination with the oven heviieg e draft opening, and e emper piete covering the opening, of :i composite bei.' comprised of supcrposecl stripe having' different eoeliicieiits of expansion, xeel bearing sleeve on the casing in which one end of the' eerie secured, e connection between "the demper plate andthe other enel o tbe bei? for operating the plate, end means for varying the effective length oi. the emposite bei, Seid means eompi'isinge bearing sleeve slideble on the ber, Ineens :for fixing; said sleeve to the oven casing, e seele, and. an indicator on the Sleeve for cooperating with the Seele.

3. ln a device of the character speciiefi, the combination with the oven having e mit opening, emi a demper plate covering the opening, of e compositeber composed.

of supeipoeecl strips having clitlerent ce eii ciente of expansion, e fixed bearing sleeve' on the easing in. which one enel of the bei' is seemed, e connection between' the damper plate und the other enti. .of the bai' :tor operating 'the plete, .find means for varying the effective length of the composite bar., said meene comprising e bearing sieeve slifleble on the bei; and means foi' fixing said Sleeve to the oven easing. l'illlillY C. .'FERBRACHE, Viitnesses CHARLES UCALLAGHAN,

ll. FRY. 

